If any the elements of list matches the predicate, we should get true as return value from any().Call List.any() with predicate passed as argument.Define a predicate that the number should be even.Returns true if at least one element matches the given predicate. Syntax 2 fun Iterable.any(predicate: (T) -> Boolean): Boolean Returns true if collection has at least one element. This example demonstrates how to declare various.

If this looks familiar, it’s because we already saw a smart cast in Chapter 6 when we looked at Kotlin’s null-safety features.The Kotlin List.any() function can be used to check if the list has at least one element, or if the list has at least one element that matches the given predicate. You can mix any type of repository described in the reference section. So, in the end, Any is the top class of Kotlins type. fun greet (chicken: Chicken) Type of animal is FarmAnimal here Type of animal is FarmAnimal again here Type of animal is Chicken here Unlike many other programming languages, variables in Kotlin do not need to be declared with a specified type (like 'String' for text or 'Int' for numbers, if you are familiar with those). Any is the same as any other type and also has a nullable counterpart, Any. The three greet() functions are all the same except for the name and type of the parameter.

In fact, the only difference is the name and type of the parameter. That’s a shame, because Farmer Sue has some big plans! She wants to add a donkey, a goat, and a llama! That means even more overloads…Īll of these functions are so similar. fun parseDigits (s: String):Integer expects the programmer to test for null or an Integer type. Yikes! This is becoming unwieldy! Every time Sue adds a new kind of farm animal, we have to create another overload of the greet() function. Kotlin allows multiple types already, when using null.

Kotlin any type